Improvement in locomotive smoke-stacks



J. R. FISH. Locomotive Smoke-Stack.

No. 215,342. Patented May 13, 1879.,

WITNESSES J4 I P INVENTOR: M M QQJEQM/ TORNEYS.

N-PETERS, PHOTO-UTHOGRAPHER. WASIHINGTON or c.

UNITED STATES PATENT Orrrcin= JOHN R'FISH, OF GRAND RAPIDS, MICHIGAN.

IMPROVEMENT IN LOCOMOTIVE SMOKE-STACKS.

Specification forming part of Letters Patent No. 2l5,3 12, dated May 13,1879; application filed I March 13, 1879.

and the shield for preventing back draft from the exhaust-steam andcurrents of air, the ob jects whereof are to arrestthe ejection ofsparks and cinders, and to deliver them back into the stack; also, toprevent the exhaust-steam from interfering with the draft or currents ofair when the engine is running rapidly from drivin g down the stack, andcausing back drafts.

The invention will be first described in connection with the drawingsforming part of the specification, and then particularly ascertained inthe claims.

In the accompanying drawings, Figure l is a vertical section of asmoke-stack provided with my improvements; and Fig. 2 is a top view orplan of the stack, a part being removed to expose the interiorarrangement.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, A represents the straight part of the stackextending up from the locomotive, and joining the inverted conoidalhead'B, the base whereof j oins the crown B. The parts B B form theshell or jacket of the stack inclosing the deflectors, spark-arresters,and other interior parts.

0 is the outside deflector, conoidal in form, placed within the shell inan inverted position, extending from near the top of the crown downward,at any suitable angle, nearly to the junction of the shell with thestraight part A of the stack, joining at this point aflange, a, providedwith openings 1), while the points 0 between the openings are bentaround the hoop d, fixed to the stack. At the top of the deflector arefastened angular supports d, the upper ends being secured to thepurfling c, fixed to the inside of the crown B. The hoop d and supports01 sustain the deflector 0 within the shell. I

D is a pyramidal deflector, supported in an inverted position by rods 9,attached at their lower ends to the inside of stack A, and their upperends bolted to the base of the deflector D, when-by it. is sustained ina central position within the stack.

Above deflector D is a wire screen sparkarrester, E, the lower edgejoined to a circular plate, h, while the upper is joined to a flange,

11, extending from a line just above the upper edge of deflector O to apoint or line above the top of the shell, and having its upper edgeturned over and bolted to an inclosing-rin g, j, which, in turn, isattached to a collar, is, covering the space between the flange t andthe crown B.

Under collar is is an annular concave deflector, 1, extending from theexterior of flange 2' near its bottom edge to the collar 70 beyond theline of the top of deflector O, and secured to said collar by rivets m.This furnishes an outwardly-deflectin g surface over the opening a,between the deflector O and the spark-arrester E, whereby sparks andcinders carried up between the spark-arrester and deflector pass out ofthe opening a, and, striking the deflector Z, are thrown outwardlybeyond deflector 0 into space 0 between the shell and deflector O.

F represents a circular dome or shield rising from the plate h, withinand concentricto spark arrester E, to a height above the edge of same.Wings 1) 12 extend from. this shield on either side to thespark-arrester, and from the bot tom plate, h, above the top of theshield, thus dividing the hollow conical space within the spark-arresterdiametrically.

The purpose of the shield and wings is two fold: first, to prevent theexhaust-steam from driving across from side to side, or forming a vortexwithin the stack, and thus interfere with the draft; secondly, toprevent currents of air, when the engine is running at high speed, fromdriving down the stack, and thus create a back drafts Ample draft-spaceis allowed through the flector Z, whence they are deflected outwardlybeyond the top of deflector 0 into the space 0 between the shell anddeflector O, and falling through said space into the openings b inflange a are delivered back into stack A, and follow this course untilreduced to ashes, and pass through meshes of the netting 0rspark-arrester with smoke and steam. The effect is to prevent theejection of live sparks and cinders from the stack without, however,interfering with the draft.

In using this stack it is made necessary to enlarge the exhaust-nozzlesfrom one-fourth (i) to three-eighths g of an inch in diameter, onaccount of a more perfect vacuum being formed in the smoke-box; also,the petticoat or lifting pipe over the exhaust-nozzles in the smoke-boxmust be shortened at the top end, so as not to stand more than twoinches above the line of the upper row of tubes. There must be two and ahalf (2%) or three (3) inches of space between the top of theexhaust-nozzles and the lower edge of the said pipe, otherwise therewill be too much draft through the lower flues.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. The combination, in a smoke-stack, of the straightpart A, conoidal head and crown B B, the deflector 0, provided withopenings at. the lower end, the deflector D, and the wire screen havingdomeF, as shown and described.

2. The wings dividing the space within the spark-arrester Ediametrically, in combination with spark-arrester E and shield F, toprevent interference with the draft by the exhaust-steam and back draftsfrom currents of air drawn into the stack, substantially as described.

JOHN RANDOLPH FISH. Witnesses:

FRANCIS O. DONAHOE, JOHN A. W. BOSSLER.

